Hey there. I dunno if this will be helpful. (Elevator vs cage?) Though just add to your awareness that - hey - I'm headed to your situation myself.
And yes, there's ton of advice out there about not comparing yourself to other people, so I'll just say what we have in common:
- no close friends... check! (actually, I _do_ have friends, I just try to stay away from them for my own reasons - partly also coz dont wanna bother them)
- never been in a relationship (and I'm also a guy) ... check! (You at least had a few dates under your belt. I had two dates, and my pals had to set that up!)
- still can't figure out what to do when I "grow up" ... check!
- the Purpose articles on this site don't seem to be working for me (at least not yet) ... check!
- Always depressed, always alone - well... not exactly. I prefer to be alone with my own thoughts, don't want to bother other people about self-help stuff and sound preachy (and at the same time hypocritical)
- never went to parties or any of that because I would freak out ... lesseee - more like I got to parties, but I didn't _choose_ to be in those parties.
- On Fri/Sat nights I was often home crying myself to sleep ... well, I'm more like depressed about my situation of not having a girlfriend and not being "inspired by a purpose"
No, can't offer any "advice". Maybe this Perfect Universe has a plan for us? I heard that Eckhart Tolle said us Contemplative types would be the "Frequency Holders" who will "anchor the frequency" of the New Earth. (Hmmm - not to hit on Tolle, he's great, just that being a "Frequency Holder" sounds like a doorstop or cup-holder or something.
BTW - my vice of choice is anime, and I'm in my "up-swing" mode. An hour ago I was depressed as hell, skipped work, and tried to get myself "out of it" by reading SP's "Overcoming Depression" article. Worked a little. You can try it.
Oh yeah, I'm 30 btw. And, as ashamed as I am, I'll admit it - still livin' with my parents. (Case of NEET / Freeter / Hikikomori?)